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\begin{abstract}
A signaling protocol may be used for resource reservation on communication 
paths in IP networks. In this sense, it is possible to signal for a
given flow from the sender to a receiver locking resources in the intermediate
routers on the path. Models of quality of service and classes, such as diffserv
can also take advantage of such protocols to optimize the use of
resources.

This work will explore the NSIS signaling protocol, considered as a
substitute for RSVP, showing its characteristics, applications and advantages.
The NSIS is still being discussed in the IETF and it has a few experimental
implementations.

The mechanisms of the NSIS are exploited through the construction of
scenarios in virtual machines, using a real implementation of the University of
Goettingen. Among other features, it is shown the traces of reservation messages
down and upstream to the data flow. In addition,  a scenario shows the resource
reservation carried out by a resource management function.

As an additional contribution, it was made a first study of an implementation of
NSIS aiming to test the feasibility of the some mechanisms extensions for use in
diffserv models.
\end{abstract}
